In message <785975EAC320644FA6447FCC7B73F11094B1AB@MILEXMIPV1.sdcorp.global.sandisk. com>, dated Wed, 7 Feb 2007, Sudhakar Wasnik <[email protected]> writes
>But never expected to function as a power source like power supply. Well, surely if it's designed to supply power, and the USB specification doesn't restrict what it's used for, it can be used for anything within the voltage and current specifications. > >> [snip] > > >But with the application of these novel devices , it may become >non-compliant, Who will be responsible for this PC guy or Peripheral >device maker Obviously, the PC maker can't know what might be connected to his product in the future, so can't be held responsible if his product is compliant with a peripheral that meets the relevant specification. That is why I wrote: What is needed is a standard that specifies clearly the requirements (functional safety and EMC) for any third-party peripheral. Then the PC can be tested with a generic compliant peripheral, if necessary. >And how these peripheral device makers will obtain compliance without >host system PC? The same way as they do at present for graphics cards, external drives and other peripherals. They test their peripheral with a compliant PC and show that the combination is still compliant. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
